24.4.1.3 Using pdb to create a Windows crashdump

Program Database files (extension pdb)
are included in the Noinstall distribution of MySQL. These
files provide information for debugging your MySQL
installation in the event of a problem.

The PDB file contains more detailed information about
mysqld and other tools that enables more
detailed trace and dump files to be created. You can use these
with Dr Watson, WinDbg and Visual Studio to
debug mysqld.

Dr Watson is installed with all Windows distributions, but if
you have installed Windows development tools, Dr Watson may
have been replaced with WinDbg, the debugger included with
Visual Studio, or the debugging tools provided with Borland or
Delphi.